County annual report · FIPS 06091
2025 Sierra County, CA Power Outage Report
In 2025, customers in Sierra County, CA went without power for an average of 62.0 hours, a total of 128K customer-hours (California average 7.6 hours). That ranks 3rd worst of 57 California counties and 57th of 3,000 nationally.
Compared with CA, the US and 2024
Coverage line is EAGLE-I's share of California customers tracked each year.
Biggest outages in Sierra County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 25, 2025 13:45 | December 30, 2025 00:45 | 4d 11h | 1,274 | 33K |
| 2 | December 21, 2025 23:30 | December 22, 2025 22:00 | 22h 30m | 1,248 | 23K |
| 3 | May 12, 2025 11:45 | May 12, 2025 12:00 | 15m | 1,243 | 311 |
| 4 | September 2, 2025 23:30 | September 3, 2025 21:15 | 21h 45m | 1,135 | 18K |
| 5 | October 4, 2025 17:45 | October 5, 2025 03:30 | 9h 45m | 1,080 | 2,025 |
| 6 | May 15, 2025 03:45 | May 15, 2025 10:00 | 6h 15m | 1,078 | 277 |
| 7 | November 4, 2025 14:15 | November 5, 2025 06:00 | 15h 45m | 1,031 | 1,924 |
| 8 | October 16, 2025 06:00 | October 16, 2025 14:30 | 8h 30m | 986 | 8,381 |
| 9 | March 16, 2025 19:15 | March 16, 2025 22:00 | 2h 45m | 906 | 2,491 |
| 10 | October 25, 2025 18:30 | October 25, 2025 22:00 | 3h 30m | 800 | 2,800 |
Outage episodes by size in 2025: 31 reached 100+ customers, 7 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Sierra County reported on EIA Form 861 for 2025, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Pacific Gas & Electric Co. | 2024 | 8.5 hrs | 2.15 | 4.6 hrs | 1.82 |
| Liberty Utilities | 2024 | 12.4 hrs | 2.57 | 8.3 hrs | 2.37 |
| Plumas-Sierra Rural Elec Coop | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of California's customers in 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,072 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Sierra County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Sierra County, CA annual power outage report, 2025, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2025/california/sierra-county